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. 2020 May 16;22(6):24. doi: 10.1007/s11926-020-00891-x

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a–b Dorsal scan of the metacarpophalangeal joint by ultrasonography. a Longitudinal view. Active synovitis in an early rheumatoid arthritis (synovium-centric disease). b Longitudinal view. Synovio-entheseal complex (SEC) inflammation (active peritendinitis of the extensor tendon and mild active synovitis) in an early psoriatic arthritis (SEC-centric disease). c Dorsal scan of the distal interphalangeal (DIP) joint by ultrasonography. Longitudinal view. Synovitis of the DIP joint in an early psoriatic arthritis patient. d Dorsal scan of the proximal interphalangeal (PIP) joint by ultrasonography. Longitudinal view. SEC inflammation of the PIP joint (central slip enthesitis of the extensor tendon and active synovitis). ET extensor tendon